The growth and characterisation of zinc-based nanostructures
Qin, L 2009, The growth and characterisation of zinc-based nanostructures , PhD thesis, Salford : University of Salford.
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Functional nanomaterials have been studied intensively ever since the selforganisation of nanostructures was first reported in the mid-1990s. The templateassisted growth of nanostructures is considered to be one of the most important branches in nanoscience. This thesis aims to develop new fabrication routes to ordered semiconducting nanoarrays and other metallic structures. Using a combination of ac electrodeposition of precursor Zn nanowires and subsequent heat treatment at 400 °C, the growth of an ordered array of semiconducting ZnO nanowires embedded in an anodic aluminium oxide (AAO) template is studied. Investigations on the transformation process have been carried out. The ZnO nanowire arrays are also examined in terms of their structural, optical and magnetic properties. The effect of heat treatment is also examined at a higher temperature of 800 °C. It is demonstrated that the AAO can be used as a reactive template in the fabrication of ordered arrays of spinel ZnAl2O4 nanotube/net arrays. This involves the growth of monocrystalline Zn nanowires into an AAO template using a pulse dc electrodeposition technique followed by a heat treatment in air. The formation of the nanotube structure is attributed to the Kirkendall effect. The results suggest that this route may be extended to fabricate other spinel structures such as MgAl2O4 or BaAl2O4. ZnO whiskers obtained in these samples by different pre-treatment of the AAO templates have also been investigated. Attempts to produce Ni-doped ZnO nanowires using pulse dc electrodeposition resulted in the formation of Ni5Zn2i dendrites. A detailed morphological and purity study of these structures has been made.
|Item Type:||Thesis (PhD)|
|Depositing User:||Institutional Repository|
|Date Deposited:||03 Oct 2012 14:34|
|Last Modified:||03 Jan 2015 23:27|
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